Pump



2,648,287 111%. THOREN Aug. 11 1953 PUMP 2 Sheets-Sheet 2 F'led June 15, 1949 I F 146 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ELL E JZ -q Patented Aug. 11, 1953 BUMP Theodore- Theron,

ChagrinqFaJlsa-Lesliel 12..

Apelin;.. Clvelagdj;Heights amh 111111151 13}, Mun.- taxi Macedoniflt... Qhib, assignors t0;=: Tzhompspm Application luneii'r; 1949; SerialT No 99,186

Th s;-inventiamrelatesfleenerallyato positivedisplacement rotary pumps and moreaparificularlysma mmioil mentsa ntat flexible-rotor: positive-disammmhnump of the: type. including a-Lrubber otor:havingzaeplurality of: radialt resili'entlyifiexirh blet vanessl-or: blades; 'therearoundu and defining pumping: chambers- :therebetweem The rotor: is:

In: heretofore:providediflexible rotor pump as semblies, .-cettain dimcultieshave been encounteredrintoonneotion with sealing the-rotorand controlling the rotor: endrthrustz" For' example;

regulation pumpmshaft' seal units have relatively large cup-likaoasingxwhich are press-fitted intothe pumm casing; and require large diameterchambers tomeceive them. Thesechambers, however, cannot; exceed" the root or hub diameter of fthe pump. retor -without joining the inlet and h outlet ports: of thelpumpr Therefore, it"has been; necessary to either--useanineflloient small diameter: seal; or; to inorease -the rotor' huhdiam eter; thereby decreasing the pumping capacity andi etficiency of the pump.

The:- presentinvetrtion provides a novel and improvedwsealing. assemblywhich employe a: unique-filler: plate for correcting the diflloul'tiesaforementioned, The filler 1 plate; isaccuratel'y formed from: cartridge brassandis snuglyseated in one -endwfi the bore of the: rotor" chamber tower-but the flexible IObOI: and' closeofi -a possible byrthexfixed distance -betweennthe fi-ller -plate and the thrustsplatez- ThllSzthfibOdY- casting definingthe-npumping cavitv--fon-the flexible rotor slid ably receives a bearing assembly carryin'g the fltorsshattzandftheneiore =the rotor-rfindsiitsiown pgsitiom between theathrushands fi-ll'er plateshe: Pumping cavity:

ThGi MDRBQSiRSdS .closedtwith a: gasket-and flll lh'which? act: upon. th'efithnust plate; but; since the distanem etwe mthe thrust: and 111181: plat s is fixed-o her naicleatancev 015:2 thespump-frotor is nQt-eatl'eatedi by: variations :im toleranceswwhicharmabaorbedby; gasket :a-eomnnessiohz in thei'aream whereethe. asket contacts; 1 116; thrustmlatee The; present-i inventions. also: provides liquid;

covenand thrust-plateto;=:ble.ed tdeaem-tedsliquidzl chamber: to rlubricate othe -chamber; 'llhei stand? ipe; chamber receives; theipumpsdischarge an providesgazheadiofz liquid. thatzwill; fill-1.11115: space between; the pummvanescwith. an; inelasti mew:

dining: as: they *Dass: between: the; outletgamtrinlet, ports and therebymaintaincaehigh suotionirpullr.

at; theainletag It is; thereforaamobiectofrthis: invention provide; a; rotomsupport and; sealaammbly ion: a; rotor: positiveirdisplacementmumm whereby the:

rotor; positionsz itselfi and: not infiuencedrbyr at standpipe:.for=: water-sea1ing:-:and?- lubricatineza flexible-rotor positive-displacement 1211mm Manva-othen obiectsiandiadvanta aaof the-pres:-

ent- :;inventiom Willi manifest: to those. versed: in; thezupommaking; referenceto: the.:- detailed adescription -.vvhieh followsflandx the:

nexedasheets of: drawings: in;whicrh.v.-

Eiguredfis amend;elevationalrvievwofithe:corver: end=one flexihlezromnpositivezdi nlaaementspump embodying; theeprincipieszoia our: inventiomz.

Figurez z-is :a fragmentary: end elevational viewofiapontiozr ofi Ei' nneilwim' the covemremovedizu.

Eigure; 3.ris iaiside- .e1evationa1;2view:oi the pump: shownsimFigui-zeul-a; a

E'ixure 4 ,153 a;fragmentary-crosseseotionahviews taken on -1ine;.W. -IM of; Figure 11;;

Figurefiaisxa; crosseseetionalzview :takemom line-11' VV of Figure 1; and

Rigure 6513185 Jorosseseationaliviewi-taken 911311118 Vi -NI; of:- Figures- 5;v

As shown omthe drawings:;.

a Referring ZItOLEigUI'BSE 1i; and 3,1. a;- flexible; rotor positive-a1 displacement; pump: is 1 indicated:- generally; b n thepreferenne .-numerali. Ill ends: is;

shown-v as..:includine;r. a1 body; andra: covers .I

both made .ofilight weightmetalidie acastingmsuclri-s.

as::a-luminum-:; castings. 'IEhE-COVBE l1 xmayzcbe- 65 recei-yedi-lnaa flange-,formediomtheabqdwlzh;

seals: for the:,-rotor ehambenzaandrusesz thez end' q from... a1; standpipe chamber: back.- to the;-.-;rotmt:,

A further;objecta-ofithisiinventioneis taprovide;

drawn up: im assembly;=- witltthe body It by means of a plurality ofcfastenerselii threadied-1va body I I is formed as an integral unit to define a rotor cylinder I 4 defining an axially tapered cam shaped bore I5 which serves as a pumping cavity for a flexible rotor.

The body I I further defines an inlet port I8 and a discharge port I 3, both being in communication with the bore I5 of the rotor cylinder ll.

The body II is shaped in such a manner as to form a standpipe cavity 20 inside a casing which extends upwardly from the rotor cylinder as at Ma and around to join a lower portion of the rotor cylinder It as at IIb.

An outlet 2I spaced above the discharge port I9 is formed in an upper portion of the body II. The standpipe cavity 20 is divided by a baffle 22 joined to the rotor cylinder I4 at a point below the discharge port I9 in such a manner as to divide the standpipe cavity 20 into a so-called turbulent area 20a and a quiescent area 20b. In other words, the baffle 22 is located in such a manner as to isolate a portion of the standpipe cavity 20 in the locale of the discharge port I9, thereby permitting a substantial portion of the standpipe 20 to contain fluid in a comparatively non-turbulent condition.

It should be apparent that since the pump I is maintained in an upright position, fluid emanating from the discharge port I9 will necessarily enter the turbulent area 20a and will eventually overflow the top of the baffle 22. By virtue of the overflow action over the baffle 22, the water in the quiescent area 20b will, in effect, be deaerated and the quiescent area 201) will thereby constitute a standpipe filled with deaerated, non-turbulent inelastic fluid. Since the outlet 2I is located in an upper portion of the body II and is spaced above the discharge port I9, an adequate head of fluid will always be maintained in the standpipe 20.

As may be seen in Figures 3 and 5, the body II is provided with a drain aperture 23 in a lower portion thereof closed by a removable drain plug 24 threadedly received therein.

Referring now particularly to Figure 5, it will be noted that one end of the rotor cylinder I4 defined by the body I I is shaped in such a manner as to define an essentially cylindrical bore or bearing race 26 adapted to slidably receive a ball bearing assembly 21. A shaft 28 is pressfitted into the bearing assembly 21 and its end is press-fitted in a rotor insert or bushing 29.

A flexible rotor I! made of a resilient material such as molded rubber or the like and defining a plurality of spaced blades Ila is molded or cemented on the rotor insert or bushing 29 and is disposed within the pumping cavity or the bore I defined by the rotor cylinder I4. The end of the rotor insert or bushing 23 may define a threaded hole to facilitate withdrawal of the bushing from the shaft 28 by turning in a screw.

Figure 6 shows that the arrangement of the flexible rotor II within the eccentric bore I5 is such as to flexibly deform the blades IIa of the rotor I'I upon rotation thereof so that the blades will collapse inwardly to fill the space defined between each pair of blades when each of said spaces is approximately in registry with the discharge port I3. Thus, any fluid carried in such space will be subjected to an increased pressure resulting in the expulsion thereof outwardly through the discharge port I9.

Conversely, when the blades I Ia, after rotation through bore I5, are again free to resume their extended position because of their inherent resilience, the space between .each pair of blades I'Ia will progressively increase in volume as such space is placed in registry with the inlet port I 3. This action will produce a suction effect, thereby promoting suction head at the inlet port I8. Fluid entering the inlet port I8 will, therefore, be carried around the pumping cavity or bore I5 in the spaces between the blade I'Ia of the rotor I1 to the discharge port I9.

Figure 5 shows a sealing arrangement which includes a stationary cup 30 positioned on a shoulder N0 of the casing. An annular rin 3I made of resilient material and having flanged portions for seating a resilient member or coiled spring 32 is carried within the cup 30. An annulus 33 of packing material is placed in abutting relationship to the ring so as to be spring biased by the spring 32 against the end of the bushing 29.

It will be noted in Figure 5 that the pumping cavity defined by the bore IS in the rotor cylinder H is terminated by an annular shoulder portion Md. The flexible rotor I! is preferably of such a longitudinal dimension as to terminate short of the shoulder IId when placed in the pumping cavity or bore IS. A filler plate 34 made of cartridge brass and accurately shaped to define the cross-sectional contour of the bore I5 is placed in surrounding relationship to the bushing 29 to abut the shoulder IId.

In this manner, even though the diameter of the stationary cup 30 exceeds the root diameter of the flexible rotor, the filler plate 34 seals the end of the bore I5 and precludes the passage of fluid through the seal chamber between the inlet port I8 and the discharge port I9.

The filler plate 34 of cartridge brass may be fabricated as a stamping and displays exceptionally favorable wearing characteristics inasmuch as the abutting relationship between the filler plate 34 and the flexible rotor I1 actually improves the polish of the filler plate with use.

Referring now to Figures 2 and 5, it will be noted that the other end of the bore I5 is provided with a shouldered recess He and a thrust plate 36 also formed of cartridge brass snugly fits into this recess to bottom on the shoulder thereof. The pumping cavity of the bore thus has a fixed length between the plates 34 and 38. A recirculating port or auxiliary inlet port 36a is formed in the thrust plate 36 and is disposed in such a manner as to lie at a portion of the pumping cavity intermediate the inlet port I3 and the discharge port I9 but ahead of the discharge port I9.

The cover I2 is provided with a recess 31 which defines a bleeder passage or connection from the standpipe cavity 20b to the recirculating port or auxiliary inlet port 36a formed in thethrust plate'36.

A gasket 38 made of a suitable compressible material is provided between the cover I2 and the body II and is shaped in such a manner as to overlie the edges of the body II and to abut the thrust plate 38.

Since the shaft 23 of'the rotor I1 is press-fitted in the ball bearing assembly 21 and the outside race defined by the bore 25 provides a sliding fit in the body II for the ball bearing assembly 21, the rotor I! will be free to find its own position in the pumping cavity defined by the bore I5 between the fixed plates 34 and 36. Thus, tolerance variations in the assembly can be absorbed e mp ession t he s shetithcutivanvin th dis. ace b tww 1 lie-plates 2 desir d an 'le t nceor bin contact w th t epia eszw ll; h re ore be maintained I h s enz o n hat he b assplates 3.4. d: Q6; p a n s ally: favorab e wearin hampc istie i t; Will- Qtcc1: hat:-dischare fluid. contained. n h q i scent: are lib-Qt he tandnipe avi. -D: wi t ed in o the p mping a 'YS' hIQUEhL h ecircul ti aape u or u i ary: n e port; 3. formed het nus ete y: waxor the. reeess 31 formed in thecovenl;2 -andi will; lubricate,- he or Thisl idt bleed arrangementiandr b main enance i i liquid. head-i above: the port; itlsofl-ll the pa esabetwee hevan s-with. i ui xat' e passirom the out et etctheiniet; hen br ein ininea good-se l and minimize ing expansion at theinlet.

t wi l" thus; be a par nt; from theabove dec p io s at: his. inventi n provides; a.;flexib1e ro or: ump w th a. selfrali nme roto be w en. plateswhicb cQac wi-tb a. pump seal: and hleeder p ssag m nta nin dischar e liquid; in the; pump bore; to augment; the sealingefiiciency: of the sealt.

It, will, of; course, be understood. that: various. de ails o cons ruction max. b tva d hr u h a. wide ran ewithout; departing from the principles. or. thisinv ntiom and it: therefore, not the purpose; to: limit.- the patent ran ed hereon ther wise than; necessitated, by the scope. of the apt. pended laims.

We claim. as. our invention;

1. -A flexible rotor pump comprisin a casing definin a. standpipei chamber and a. pumping chamber and having an. open end. exposing said chambers, a removable; cover for: said open end, a compressibleigasketbetween theicoizerv and:casing, fastenersfor tightening. the gasket and cover against: the.. Casing. to seal the. chambers from each other and-to seal the casing, saidpumpingchamber; havin xali'gned inlet and outlet ports at.- the upper end: thereon with the outlet portdischarging into the standpipe. chamber intere mediate. the. topand bottom thereof, a bafil'e in thestandpipe chamber underlying. the outlet portand; extending upwardly .to a. level. abovethe outlet. port to. divide the chamber-into a. turbulent area portion and: a quiescent area'portion, saidstandpipe chamber having an outlet in the upper portion thereof, said casing having: a bearingchamberaxially aligned-withthe-pumping-cham-. ber,; a. bearing slidablein said bearing chamber, a rotor shaft'carried by; said bearing, a rotor carried bysaid, shaft in'said pumping chamber and having flexible vanes defining pumping spaces therebetween, plates bottomed in opposite ends of -the pumping chamber defining-a fixed dimension length. therebetween andreceiving the end thrust of the rotor and sealing the ends of thepumping spaces, a shaft seal, between the bearingand rotor, and aligned-.bleeder passages inthe cover and adjacent, plate. joining, the quiescent area of the standpipe .with the pumpin spaces to maintain liquid therein for sealing and lubricatingthe rotor and minimizing expansion at; the pump inlet whereby said gasket will yield to, tolerance, variations "when v the fasteners tighten. the cover but said fixed, end plates will prevent variations in the relationship of the rotor and plates.

2. A flexible rotor pumpassembly including a casing-having a s pechamber, a pump n chamber: with: an. outlet po t. at the upp po portionof said cavity includin DQ310 3 abo 9:

a; imid the eof.- iscba sine: nto tbetandn pe hamb r-e d. a eari ch. herwallal gnedwithi he umping Qhamb ri. a,. .dab e bearing; in; the bearing; chamber a: ro or shaft; carried bx.

1 the bearing; a rotor on; thesheft. h v n flexible:

es e i c' u pila ez sp cestberebe ween; and; arranged: to; be r tated; in he pumpin chamben. a. seaipiate. bottomed in.- the pump n chamber and losing. the' nds .1: the-"pumping:

.- spaces to pa i ion, the bearin and; pumpiiriisv chamb rs, av hrust. plate. bottomediimthei other end of the; pumping-chamben. aspringplfm hat-t seal betweenthe, bearing: chamber andiseali plate and acting; on, the rotor-- to. urge; thetroton againstthe thrust plate,.an-. endv cover and: asket:

finin a plurality f; circumfer ntiallyispa ed;-

radially extending resilien bl es deformable upon. rotation in. said bore. to, pull.- a suctiom at; said, in et: p r an produce adischarsepressure a said, disch rge. port, an. outlet:'spacedt-Ieonm said dischar e por and. formedin anauppenpen-rm n f: said b.ody-,; ax bailieplate in; sa-ixisncavitnv. extending into the region between; saiiieoutlgehz' and said, rotorylinder and. arran ed toexten above said rotor cylinder whereby-asubstan iak the level of said, rotor; cylinder maybefill di non-turbulent fluid-4 front said: discharge; port; andv a bleeder, connection in. communication tn; he ur l nt. portion f1SaiQ AI=i $aB a: portion ofv said eccentric-borezin;saidtrotor yl der; intermediate said inlet: port, a dz-saidv charge port, whereby. saidzfi xibl rotors manhe; sealed and: lubricated: with; n: inelasticwdeaerated fluid;

4; In a; pu p, a bodydefininsza rotor cxlinderf having; a bore with an. inletj-pQr-t; anetga discharge; portand: further. defining a, .vented ay join said rotor cyiinderpinp ommu a on:

with said; discharge port ro or defini plurality oi spaced.- flexible. blad s. defer able; when rotated inv saidf bore to pull asuetionsaidcinlet port and topmducca dischar e-p sure at said. dischar e port, aller pla e et end of; said bore, sur undin ct. shait i? I rotor; athr-ustplate in the other end of- 'said;

bore, said thrust-plate;defininga-port; boreintermediate said inlet andtdischargevport a gasket on saidbody and; a ot forsaid b d I toabut. aid thrustplate; and; said cover de ing: a, bleeden passage I from said. 'cayity to portinsaid.tbru p e whe byvsa d be. e beprovided with fluid; from said ,cayity-; to -sea and; lubricate said flexible blades. 0t, said rotor 5., Ina pump assembly, a body; and. acouen cooperatively assembled and forming. at-pump; ing-cavity havingan inlet portand- .a discharge. port and .further forming a, standpipe cavity-ag jacentto and in. communication with the dis e c r e p t ai pu p, said o y av na. n outlet, spaced above said I dischargeport, a, baflie plate in said standpipe, cavity substantially in; terposed between. said outlet. and said discharge portandblocking; thedirect, flpw, of, fluidv there: between, said cover hayingabl eeder passageex: tending from; a portionoft the standpipe cayity;

on an opposite side of the baflle from said discharge port to a portion of the pumping cavity intermediate the inlet and discharge ports of said pump, said pumping cavity lying below the level of said bafile in said standpipe cavity for continuous flooding thereof by the discharge of said pump and said bleeder passage operative to provide the pumping cavity with non-turbulent inelastic sealing and lubricating fluid from the discharge side of said pump.

6. In a positive displacement pump, a casing having a, rotor cylinder and a standpipe cavity adjoining the rotor cylinder, said rotor cylinder having a discharge port and an inlet port, said cavity lying in communication with the discharge port of said rotor cylinder, said casing having an outlet and having a baflie plate blocking direct flow from said discharge port to said outlet and dividing said standpipe cavity into a turbulent area chamber in the locale of said discharge port and a quiescent area chamber below said outlet, and said casing having a bleeder passage formed therein in communication with a portion of the rotor cylinder intermediate the discharge and the inlet ports of said rotor cylinder and said quiescent area, whereby fluid emanating from said discharge port will be deaerated and recirculated through said standpipe cavity and said bleeder passage to seal and lubricate the rotor in the rotor cylinder of said pump and will flll said standpipe cavity to continually flood the rotor cylinder.

7. In a pump, a casing having formed therein an enlarged pumping chamber and a smaller bearing chamber coaxially aligned therewith, a flexible vane rotor having a plurality of pumping spaces between the vanes in said pumping chamber, a shaft connected to said rotor and extending outwardly through said bearing chamher, a bearing journalling said shaft in said bearing chamber of said casing, an annular shoulder at one end of said pumping chamber, a plate abutting said shoulder and being complementary in shape to the contour of said pumping chamber, said plate being engageable with the flexible vanes to close the ends of the pumping spaces and a seal between said bearing and said rotor, said seal including a cup-shaped housing member firmly assembled in said casing and being of greater diameter than the root diameter of said rotor, said seal further including springpressed sealing elements of smaller diameter than said housing and engageable with said rotor.

8. A rotor and seal assembly for a flexible rotor positive displacement type pump comprising a body casing having an end face intersected by an enlarged pumping cavity, said end face having a counterbore therein around said cavity, a rotor in said pumping cavity, a cover engaging said end face of said casing enclosing said pumping cavity, a thrust plate in said counterbore and corresponding in shape to the configuration of the pumping cavity, said thrust plate engaging one side of said rotor, an elastic gasket between said body casing and said cover and including portions overlying the body casing and abutting the thrust plate, means to draw said cover into firm assembly with said body casing, said gasket being elastically yieldable to tolerance variations, and spring pressed sealing means at the other side of said rotor bottomed against said body casing for engaging said rotor against said thrust plate independently of the degree of compression of the gasket by the cover, whereby said rotor is self-aligning in said pumping cavity.

9. In a pump, a casing having formed therein a bore, an enlarged pumping chamber in one end of said bore and a smaller bearing chamber in the other end of said bore, an annular shoulder between said two chambers, a flexible vane rotor having a plurality of pumping spaces between the vanes rotatable in said pumping chamber, a shaft connected to said rotor and extending outwardly through said bearing chamber, a bearing journalling said shaft in said bearing chamber of said casing, a shaft seal between said casing and one end of said rotor and a thrust plate shaped complementary to the shape of said pumping chamber engaging the other end of said rotor and sealing said pumping spaces, said seal having spring pressed sealing elements engaging said rotor inside the root diameter thereof and being bottomed against said shoulder to load said rotor against said thrust plate.

10. A pump, comprising, a casing open at one end, a first counterbore in said open end of said casing, a second counterbore in said casing adjacent said first counterbore and providing a pumping chamber, a bearing chamber in said casing adjacent said pumping chamber, a thrust plate in said first counterbore and closing one end of said pumping chamber, a cover connected to said casing closing said open end of said casing, a second plate in said second counterbore at the other end of said pumping chamber, said first and second plates providing a fixed dimension cavity therebetween, a rotor in said cavity and having a shaft extending into said bearing chamber for journalling support therein, and a spring pressed shaft seal in said casing adjacent said second plate and biasing said rotor into running engagement with said thrust plate.

11. In a pump, a casing having a pumping chamber open at one end and having a counterbore inwardly of said one end, rotary fluid displacement means in said pumping chamber, a

thrust plate received in said counterbore and having running engagement with said rotary fluid displacement means, a cover closing said open end of said casing, a gasket between said casing and said cover having portions extending between the thrust plate and said cover, said thrust plate and said counterbore providing confronting abutment surfaces limiting inward movement of the thrust plate by compression of said gasket portions between said cover and said thrust plate independent of the degree of the gasket between the casing and the cover.

THEODORE R. THOREN. LESLIE L. ASPELIN. JOHN F. MURRAY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,346,165 Berrenberg July 13, 1920 1,558,620 Kagi Oct. 27, 1925 2,182,072 Czarnecki Dec. 5, 1939 2,189,356 Briggs Feb. 6, 1940 2,195,812 Czarnecki Apr, 2, 1940 2,312,891 Ferris Mar. 2, 1943 2,455,194 Rumsey Nov. 30, 1948 2,455,297 Curtis Nov. 30, 1948 2,473,309 Stephens June 14, 1949 2,544,990 Harrington Mar. 13, 1951 FOREIGN PATENTS Number Country Date 94,373 Sweden Jan. 26, 1939 

